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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '571e4f1842cd5478d945b83e38d85b94bd1ce4fb0eb18d57a7d6d7cb7f616705' 
  AND token = 'P/WaQPZC7EH4Z/AlBOyZwYmfd4wiJfbOwENhNEkxTjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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