SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0973787d4a15509a832d3e7188851607dc18aa5fbb07b25c7c0d66a8b8d69a97' 
  AND token = '2BGuADWBzrbKFnfxYgnHwUsW4VIlkVsfiZuiTJxCGlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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