SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22b74493153fa927c639e1553480595cc4eab637e53a5158670cdcd26df4690d' 
  AND token = '3FWJDHX58lkm0qB2jNUDWMADRX6mMp48dCJuRzkKJ/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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