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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a54568141026890517be3665a770d09a739d8ac7c8e69c4844cd7c3d36f4127c' 
  AND token = 'bmwX3IyM/fXCpha6utTjYDqsixBo7amxDrUr2BKkn5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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