SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8384770322fd4259192c292d2560330e82645523c8cdfa807091e7f5f8910437' 
  AND token = 'yUVzt8I0x2XuxZSBpXqjOL+0OcwfFYg2aHOmwWGaUOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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