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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '805430aefed7e3d91e876cf27138848875f9b1b7bd1469880b802ea02912eab2' 
  AND token = '8e65GimXGhWRZRAVmjqe2p72Xqg8XGvwvIz6B8db6qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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