SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a0fde2e3d4c5e1dfbd63efde99f24bcdd07e46d4b9d3325902dd50f7ab3e409' 
  AND token = 'ZX/iqPPgfjj2vVQyDIDZ//Q5LV2tqBFgCTQUP/BUKW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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