SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d93e00fc41291b296f17160575181d03818dbb5dc80c5a48d366970397340ab' 
  AND token = 'GxGFgKBQST3KKcBaDVJHrCvE1J+zrG+fLjGnCc0Q8DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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