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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cadf0b2304ad12ee0591d2f00a3355bef7f3a77d6dbe1a41841fe40804b497dc' 
  AND token = '8lh07B3hVcPP3MQR7bXyMZKAQNVdNwzEYVOEVYfxmq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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