SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea825350e7d8ca0febbb40c20a11d3a2543792de719f184838a190cfb72dc979' 
  AND token = 'JMFmIhBln8jpC+yhqBMEi2GuqFT+w85Ea6t2zH+d3To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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