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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb6a0fd7a23c35a3fba6ad25fed071d05463e499e1e650a553f7408309ae3adf' 
  AND token = 'a6Rw/WLDCnBP7b9jUS685qlpfbtB65SJRUPeqiSuybs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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