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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5734360343d519e2642d2fda5504ac6981a01205b4cf7b018d9891d6024cb4b6' 
  AND token = '4WBxz8Yjth/3yHbxkOUML40ypelLzXPYjsGdSdzCDNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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