Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70cd6bb90cf784c5ff269593a17d0d1d8bcc70642da43d5fa9259a86e1ed9b0c' 
  AND token = 'x4oXfaHmnElY2X+5RR0NWOSo1OuybOaf0ufkmw2YEXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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