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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7da219dbc5d6bcbea3b3e158915c0140edb395e2b3fb959fd693fedc00e222ac' 
  AND token = 'UB5+roCSa06XRg4/t9jz2zScSzRY3b95RTC6BrUr50s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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