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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba32ee0100620035db6c89eff03ee4b355675cf8383878430bf554c5d09e6989' 
  AND token = 'Jb7ya43fJv/qxO/R5xT+x+Zgl2veSpohc67nVc9xgfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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