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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c45ec887db4b850b856df8b78a4ea31da6db743cb8c6e1270a4ec44ea2f897e0' 
  AND token = 'Ix8LhzFLuji198PxXL3TeYKPTF4kGeVq8hd3mqcsdVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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