SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e3259483dd87879c14990660b929c867e0f4b1ede371bfc4a4b038bef1ff691' 
  AND token = 'YSu1iOuAMVbiZNQ1zqcghJoCgK6pm6ExhVdG+F0qVjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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