SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc4f5022ea26edaf1ffc9b32ff043929e93117fffd382fa79cc636a8370570e4' 
  AND token = 'eC3Bg7PEqDdyKA8rSoLRgj6NSVgZ7zwUWIV+7SCSxiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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