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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad72b3f93fb90caa75406ec18c1fb071bc82efde30e2aa0fa538819b3994ba86' 
  AND token = 'Sz9u4Gd5m+oA52ElSt9DB16l38fz16wiXHAZyL403EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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