SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6329dd5783e65de1ef14844cc1b50cd68952e908c14d8262784487520e0f10f' 
  AND token = 'wxUuQB8GXsNvftALC+T5QzsVsZXukxaQXSGP3slOQvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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