SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ca5a8bd6d8eb505faf238a5686ecbf57ea42999aa32c5a9af83449fe3720d13' 
  AND token = 'C3JwtCL42/+czp+Gx2bl2UiMrlW/YUON0ZaqWBV1Zf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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