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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '579cbcc0e9b7e35389145dd70e943da1981a9599e6fe62e1c38b67a1f9d8cca3' 
  AND token = 'uODlJjxJBwnVpkUy7Xi/ZGUud63cGkknNKemefu9asA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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