SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '987e1cb29950352d219862cd2ec59c753190f9c081d59c3e6fa5af8f47ce7e08' 
  AND token = 'dafZzchtj+g3x/JuVnVSANcv+Mrdfeu/XCIm5BmDqmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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