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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8438eaca730c40f7ea2faf547896907835eba4f41f6768a19c4a8d302818d613' 
  AND token = 'WmHHm0fEg7o2h9LHM1RVWgefk0+AP6AkXj08AmJurJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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