SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b934df999c788f547b4c9285a5356782fc448ad5e84e042be5e376943060a67' 
  AND token = 'ZcdLwF7CNbbg9Lrj7YG/TGLr4NoNSeQNUVrZPgKXUCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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