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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5c8d3fa204cec2c9f94a938e78135e6c89f3a78589cb12ec346ee9bb0400452' 
  AND token = 'Qi3AH8Jn0yokPdxibAjjuXBicGSOWZI4ORdnV1rgPKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}