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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ac60bd5be4a56a5bea21ef55f1832cbaf2a8879dd030df66c00c9a4cb49979c' 
  AND token = 'vKi+tc8W0JJRDHAGBVId7LXCD45BA8NHxrt7zP5VN00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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