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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd578142cc080b05ed31f22843cda80ea4a4630f16d4a530427c72b5bacf23f7f' 
  AND token = 'XewA8IuRg3TZ7SN7lzhQEf3sh65BWtUTJ1IjytC5O90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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