Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d4e3d56a90ddf22be770fc3bb60a7eb6e1a475416e46966dc907b2262f0029b' 
  AND token = 'WcurXK/3hz6lUFYkc6IzQ8wZ5f4MTMs/IeAaW0NIQFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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