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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c472452f9be62be014a131aa24c5665fd0c5bdd52ab9705d7404b7cb5840a16e' 
  AND token = 'fhnL+T6UFEmh92G9O9wiNeKvLEdscp0wrA83yXfIg0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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