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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e98aea8542e0a774b8728f29c4545d2e82c12fed7d09b524a20e4f894f5968f' 
  AND token = 'bO+AgmW8xacNuBBzwB+jro2X3ZBVmVtJnuaAOkSqMfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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