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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5d6fa7084dc5a27f5cd879996ef9a38e6d545d710980a316a8ae36ac3f62dc8' 
  AND token = 'hdBMStyNKjVZePvWHCdDkypVWcPa6echIFzTxMms8to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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