SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6e1b2215f0675bd9836015303afa53d3ec123da42442317a7bf1345998840e9' 
  AND token = 'OsYvg7uIrvEracmnYjxIuMJ8fPN/4gZDQ6Z5dtefcK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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