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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57ad885e6d6de7687b33db9c4fd6beb0afa860419521a359391c46c17ee200e4' 
  AND token = 'b6UrhjAKElH06yKNd+7WcZmzSB/LNfQPafq0tMNkoIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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