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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbb480c7f3f4c24e6ceca548ffbcf45325aa1799d03603f3dc5ae4dff4e70aa8' 
  AND token = 'PEhyfaZVSD/AL568q/xj50HuqIhqPv5O2XM99uq45Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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