SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93da74408fd58d939d0958663e97e2ce1fe8bb09f029d3365063cef0a126633c' 
  AND token = 'rRRpzcLJpKF8niY6STpjfwJEBj2Uzoc1w+6moqlFin4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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