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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e0a933c7e3631ea7eb8e00f41e7912ed7a032c3dc35b14639056944c398923d' 
  AND token = 'Zg6DdjmiNdMmodaPapnyIFQOam+MgwgI0GczMAWsduk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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