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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ebd44a1c5c403dc0cd627e20d0d5491cc5d015e16078ce4f5c71559fbca6a7b' 
  AND token = 'E8DiXdavGHa8DXPnY4jFL/I1r4MsncnKZ8q/6ICpPAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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