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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cab13cae69e613dcb5e28498e638632d05f12ef840d1692143e8bac183f67003' 
  AND token = 'xGHBr7QsOXc6amym2b94dS04QkWgqzMZe4GKMZ8hJa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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