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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6629492085be168160612b164f5ec966ff5c0e898e8f4be12ff1725fd2b55cc2' 
  AND token = 'XoTiilChtmJdRP6NhaNv4RmcEBvND0lFuYFqFPvAYb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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