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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '722c9e1b4fdf1b42814b92816b447689079784ddf0db460bc3778a8db2dd0c4c' 
  AND token = 'sQM0GylfcXmHybjvZTJrsYoUC+pzTD7HFtru2vdIS5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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