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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ace2a2ba318f81a761dc971b4f1d230ca09ec234c2fc4323e348d8b4c5e8832e' 
  AND token = '5znH1Qb/vgK1fzD/pylq6rxAEaRsEtyRfeIEGpvOlnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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