Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7648c34a4e00649490472fe3ab494a51c60c1fc1922cfcc7e45641eb5ada0c2a' 
  AND token = 'jMsB89ot59/QHvjHrrtWpcE+JskHxNTITurdn99Qat4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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