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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de957ddc6be8b665297194f683bc681555a3b25f34b9061c4a3b47ee31ca0a23' 
  AND token = 'r0wenOhT+bYYbjCYjuX1fgcat3h6RHp1ePtaGglDlPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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