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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e055abd8e221d1b721903a7fb237b02bbbfe93d932aad781af341392e382a7d5' 
  AND token = 'TmG0yaRzph91sUP26derIPvVUP8kNL1x26v+hvBpclU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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