SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4536def195c69a50c898b5e2038f912d5659d7d82b0f1f7b444b66dc6959cc1' 
  AND token = 'GrPlj9AP4aDJmLHKv//P/S9+HqcCej+iUfb4zsealv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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