SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e71e2d4b912000991f1afdf73c6f68418bb6ae333c4f09d539b22dadd516382' 
  AND token = 'h4hG5dHbGxXsYN//sOHnw5nijj8dKbMW4tXlnPdSPsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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