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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4cad6f9bba4cb9491b72fc2b5dc63425d47231f0aa48ade63081db5d41ed3b0e' 
  AND token = 'ztudTvAkIpYvZ0Q0GbWem0e10dHMIm5EZkeLZxgr+dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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