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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd93d3ae43998c9748a504c4e9053d66fe7ce2510d66647086736b8347d1ee5a4' 
  AND token = 'm/iIohwM40JBX6MKXh15vccSr4ktUC5ukLJ2LNuzV4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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