SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3417451ee82ae3a2cbcea3354398640c745002cda8f8c9a90e2997090efc6788' 
  AND token = 'U4BDXEmGa7rzfMF//Y9xl7ulgZnvYpWisqIo1j07U2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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