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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1bc20a228c93787bff0a3220ac5f9304ec9f9bafb5857ad6b364ca52410cac8' 
  AND token = 'uKzIpdivc7cRvSd4samwjIz4wahjRlnDDsj+aSSANME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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