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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82a6aaca29de90e2aa65e67642bb80ce60e6e4c9339ab55632d25f1e0eeca435' 
  AND token = '6o2/ph82zJegSTeKUVmoGP/NcC09Pip/yDq4m346oQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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