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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16dde07a6be34c54a8f1c7116a8a564047e7298a64f069e512b3ea2ae2ba7d97' 
  AND token = '5LK7zwkTGGNnM2XwXQjx1V7CQvfSn807JdDXLycEW8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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