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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e68fae307739175112b6377679648770c61e6d386bca7dcbbbaf82269ceec2e9' 
  AND token = 'J4xCdOWPuqm1Z8+2gQQAOH5p36bguXwnDrl0vKT3Es8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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