SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '196463b78a3f8f37d1d18592314e430abdefd96d06ae1af83b0f617636e2d215' 
  AND token = 'IacQkQKbhJ7BR/zj1etQpYULhp0Jk4uyka+hA+SI/V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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