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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '113041fb53c62853ee1b6f702706d0aa98d711c115a77a60b1e50f1b58010245' 
  AND token = '0RylaDXhK5ZoGNvLSvvTtJN1NgweZrF3aymK4j3Fe2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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