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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d70f663885b6ce51e6e0a5a912bff66aed7b8a31a46b918a29c6d68acfbb1b9' 
  AND token = 'l5LHDoNXfJ3fyZ9GQrbiVRu6GFIG2nodrRHHZEkWFh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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