SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5133b8ceee02b2bae2f62928dc8627a345b608f8c8d620a1f6b78efdc3a56140' 
  AND token = 'x0/UZJj3AoijhgkgwgtsVQNJB2G6y+SN21H8uzLv85w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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