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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d03e51c280bf81504bd265ae688f8a70241b8ece8a11d64d55d8e70e9b33076' 
  AND token = 'yBZ5U1ibchF6yQFdZqekydgr3yPn8I1E8GUVAJfwn8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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