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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12cd5e80165bf1df4fb653f14c5b1b57f4b666de1fb9b27af87571d24bf059ce' 
  AND token = 'XeSf1A9TmPadCIgV+hEu448pc36Ct8p+zpEoftkrypg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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