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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77e9a15f7d163e0afc63fc86a253c576b2ed08c15f54ed181c107c3541d39168' 
  AND token = 'PcQPUiNX+1QFuLns4Gr4HOXlZf1//04rIdQf7IQI1Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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